> for medieval engineering? Are there other examples like this? Nails. This single Roman fort in Scotland had nearly a million iron nails, all of them hand m

> for medieval engineering? Are there other examples like this? Nails. This single Roman fort in Scotland had nearly a million iron nails, all of them hand made: > When it was excavated in the 1950s by Richmond, a large pit was found in the summer of 1960 containing 875,400 complete iron nails (Square shaft) ranging from 50–410 mm (2–16 in) plus another 28 (round shaft nails) weighing 7 tons, together with other iron objects, including cartwheel rims weighing a combined total weight of ten tonnes (Inchtuthil Nails by “Roddy Fraser”). https://en.wikipedia.org/wiki/Inchtuthil https://en.wikipedia.org/wiki/Inchtuthil That's just one fort in a remote frontier of the empire. They were mass producing stuff like this, by hand.